can be defined in several ways using:
data. Wright, who was a USDA employee
btw, used only pedigree data to calculate probabilities that gene pairs are
identical by descent.
|G = Genomic
relationships use genotype data to estimate the fraction of total DNA that
individuals actually share.
|T = Fractions of
alleles that two individuals share for loci that affect a certain trait will
be termed QTL or T relationships. The
term QTL often refers only to loci with large effects, but here includes all
loci that affect a trait.